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Stock-Based Compensation and Stock Options - Stock Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Shares        
Options outstanding, beginning (in shares) 600,000 775,000 425,000  
Options granted (in shares) 400,000 150,000 400,000  
Options forfeited and canceled (in shares) (50,000) (325,000) (50,000)  
Options outstanding, ending (in shares) 950,000 600,000 775,000 425,000
Weighted-Average Exercise Price        
Options outstanding, weighted average exercise price, beginning (in dollars per share) $ 9.93 $ 12.78 $ 19.20  
Options granted, weighted average exercise price (in dollars per share) 6.95 8.55 8.07  
Options forfeited and canceled, weighted average exercise price (in dollars per share) 8.55 16.09 29.58  
Options outstanding, weighted average exercise price, ending (in dollars per share) $ 8.75 $ 9.93 $ 12.78 $ 19.20
Exercisable and fully vested (in shares) 475,000      
Exercisable and fully vested, weighted average exercise price (in dollars per share) $ 10.30      
Options outstanding weighted-average remaining contractual life 8 years 5 months 23 days 8 years 6 months 20 days 5 years 6 months 11 days 5 years 9 months 15 days
Options exercisable weighted-average remaining contractual life 7 years 4 months 17 days      
Vested and expected to vest, outstanding, aggregate intrinsic value (in dollars) $ 0 $ 0 $ 120 $ 0
Vested and expected to vest, exercisable, aggregate intrinsic value (in dollars) $ 0      
Outstanding and expected to vest thereafter (in shares) 475,000      
Outstanding and expected to vest thereafter, weighted average exercise price (in dollars per share) $ 7.20      
Outstanding and expected to vest, weighted average remaining contractual life (in years) 9 years 6 months 29 days      
Outstanding and expected to vest, aggregate intrinsic value (in dollars) $ 0